Debasish Das and Asutosh Mohapatra emerged sole leaders in the senior and junior categories of the S R All-Orissa Open Chess tournament at Infosys in Bhubaneswar today. Niali school boy Debasish beat Bibhuti Das in the fifth round to lead the table with full five points. After the completion of fifth round, Rajendra Sahu and Rabindra Ojha shared the second position with 4.5 points each.